A highly linear CMOS image sensor with a digitally assisted linearity-calibration method

نویسندگان

  • Fei Wang
  • Liqiang Han
  • Albert J. P. Theuwissen
چکیده

A highly linear CMOS image sensor designed in 0.18μm CMOS image sensor (CIS) technology is presented in this paper. A new type of pixel design is adopted to cancel off the nonlinearity of the source follower (SF) and hence enhance the linearity. Furthermore, a digitally assisted calibration method is proposed to improve the linearity of the image sensor. The measurement results show that the new type of pixel can achieve better linearity performance comparing with the typical 4T pixel. With the calibration, the linearity of all types of pixels have been improved.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

A 0.1-5.0 GHz Reconfigurable Transmitter With Dual-Mode Power Amplifier and Digitally-Assisted Self-Calibration for Private Network Communications

—A 0.1–5.0 GHz 65 nm CMOS recongurable transmitter for private network wireless communications is presented. The transmitter integrates a 0.1–1.5 GHz high-efciency dual-mode power amplier to support low-cost narrowband applications and a 0.45–5.0 GHz efciency-optimized pre-power amplier to support high-performance wideband applications. A wideband PLL frequency synthesizer, DACs with recon...

متن کامل

New Method for Analysis of image sensor to produce and evaluate the image

In this paper, a new method for evaluating CMOS image sensors based on computer modeling and analysis is introduced. Image sensors are composed of different parts, each of which has a specific effect on image quality. Circuits of image sensors can be evaluated and analyzed using circuit simulators or theoretically, but these methods cannot help to produce the final image. In order to produce th...

متن کامل

Microsoft Word - EI2018_paper_Fei.docx

This paper presents two on-chip calibration methods for improving the linearity of a CMOS image sensor (CIS). A prototype 128 × 128 pixel sensor with a size of 10 μm×12 μm is fabricated using a 0.18 μm 1P4M CIS process. Both calibration methods show obvious improvement on the linearity of the CIS. Compared with the voltage mode (VM) calibration, the pixel mode (PM) calibration method achieves b...

متن کامل

Digital calibration technique for highly linear wide dynamic range CMOS imaging sensor

Introduction: The dynamic range (DR) of CMOS imaging sensors is limited by the voltage space at the integration node. The DR can be nonlinearly expanded by scaling the integration time or the integration capacitance [1]. However, the imaging sensor’s linearity is low from these wide DR schemes. Biomedical and scientific applications require imaging with high linearity [2]. The self-resetting pi...

متن کامل

Digitally Assisted Analog and RF Circuits

In this paper, the importance and perspective for the digitally-assisted analog and RF circuits are discussed, especially related to wireless transceivers. Digital calibration techniques for compensating I/Q mismatch, IM2, and LO impairments in cellular, 2.4GHz WiFi, and 60GHz WiGig transceivers are introduced with detailed analysis and circuit implementations. Future technology directions such...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2017